A guide for ADU construction in San Jose, California

Yes, San Jose permits ADUs on residentially zoned lots with existing or proposed single-family or multifamily dwellings. The city has streamlined processes to encourage ADU development.

The permitting process can vary based on the complexity of your project. For standard plans, approvals may be quicker, while custom designs might take longer. It's advisable to consult with the Planning/Zoning Bureau or a professional familiar with local regulations for accurate timelines.

For single-family properties, you can have one ADU and one Junior ADU (JADU). Multifamily properties may be allowed multiple ADUs, subject to specific regulations and limitations.

No, there is no minimum lot size requirement to build an ADU in San Jose. However, other zoning and building standards must be met.

Yes, obtaining a building permit is mandatory for constructing an ADU in San Jose. The permit ensures that the ADU complies with local building codes and zoning regulations.

Yes. The minimum size for an ADU is 150 square feet. The maximum size varies: for detached ADUs, up to 1,200 square feet; for attached ADUs, up to 50% of the existing primary dwelling's floor area, not exceeding 1,200 square feet.

Yes, two-story ADUs are permitted, provided they comply with height restrictions, setback requirements, and other zoning regulations.

There is no specific limit on the number of bedrooms in an ADU. However, the total size of the ADU must comply with the maximum square footage allowed.

ADUs must generally maintain a minimum setback of 4 feet from the side and rear property lines. Front yard setbacks vary based on zoning and other factors.

An ADU can share utilities with the primary residence or have separate connections. Separate meters are optional and may be installed based on the homeowner's preference and utility company requirements.

Fire sprinklers are not required in an ADU if they are not required in the primary residence. However, if the primary dwelling has fire sprinklers, the ADU must also have them.

Yes, new construction ADUs are subject to California's Building Energy Efficiency Standards, which may require solar panels, especially for detached units. Compliance depends on the specific characteristics of the ADU.

Rental rates for ADUs vary based on location, size, and amenities. In San Jose, ADUs can command monthly rents ranging from $1,500 to $3,000 or more, depending on the neighborhood and unit features.

Short-term rentals (less than 30 days) of ADUs are generally prohibited in San Jose unless specific conditions are met. It's crucial to consult local ordinances and regulations before listing an ADU as a short-term rental.

Homeowners Associations (HOAs) cannot unreasonably restrict the construction of ADUs. However, they may impose reasonable standards related to design and aesthetics.

Adding an ADU will increase your property's assessed value, leading to higher property taxes. The increase is based on the value of the new construction, not the entire property.

An ADU can significantly increase your property's value, often by 20-30%, depending on the quality of construction and local market conditions. Additionally, rental income from the ADU can enhance the property's appeal to potential buyers.

The cost to build an ADU in San Jose varies widely based on size, design, and materials. On average, construction costs range from $100,000 to $300,000 or more. Garage conversions tend to be less expensive than new constructions.